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Table of Content
20 June 2018 Volume 37 Issue 6
Efforts to enhanceacademic level of college physics teaching
ZHONG Xi-hua
College Physics. 2018, 37(6): 1-6. doi:
10.16854 /j.cnki.1000-0712.170612
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This paper expounds the basis of the Newton's laws and the universal gravitation law as well as the Coulomb's law established，the basis of several important physical quantities introduced，finally discusses how to properly evaluate the symmetry and the conservation law in the college physics teaching. The purpose of this paper is to express a kind of teaching ideas，namely，to clearly expound or profound interpret for the rich physical thoughts and the special way of thinking in physics，is an important embody of the academic level of a physics course，so the efforts to enhance the academic level of physics courses should become an important aspect of improving the quality of the college physics teaching.
Abstract to image thinking transformation of solid state phyics teaching in mateirals science speciality
HANG Tao，LING Hui-qin，GU Jia-jun
College Physics. 2018, 37(6): 7-9. doi:
10.16854 /j.cnki.1000-0712.170543
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Based on the current teaching of solid state physics in school of materials science and engineering at Shanghai Jiao Tong University，and combined with the characteristics and difficulties in study of solid state physics，this paper provids some ideas and typical examples on how to visualize the abstract concepts in solid state phyics，which is expected to give reference to the teaching of solid state physics in similar majors.
Discussion on the problem of charge distribution in current carrying conductors
YU Feng-jun
College Physics. 2018, 37(6): 10-12. doi:
10.16854 /j.cnki.1000-0712.170461
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The problem of charge distribution in a constant current conductor is discussed.Based on the Hall effect，the charge distribution in the infinite cylindrical current carrying conductor is derived，and the formula of charge density in a current carrying conductor of arbitrary shape is given.
Application of reduced dimension method of Laplace equation based on conformal mapping in solving temperature field
YIN Yong，WANG Fu-qian
College Physics. 2018, 37(6): 13-15. doi:
10.16854 /j.cnki.1000-0712.170335
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1604
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The temperature field problem is solved by conformal mapping，the solution domain is transformed into a band domain or a semi-infinite band with an adiabatic boundary by the transformation function. Thus，the two-dimensional temperature function is reduced to a one-dimensional function，then the boundary value problem of the Laplace equation is solved expediently，and its temperature distribution function is given，and the isothermal map is drawn by software MATLAB.
Calculation of space electromagnetic field of rotating charged cylinder with variable speed
KUANG Xiang-jun，JIA Lian-bao
College Physics. 2018, 37(6): 16-18. doi:
10.16854 /j.cnki.1000-0712.170406
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1833
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625
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Using the field axial symmetry of rotating charged cylinder and Maxwell’s equations tactfully，we derive the infinite series expression of electromagnetic field for variable speed rotating charged cylinder by using the result of axial symmetry as starting value.
Motion locus of banana kick with air friction
HAO Cheng-hong，HUANG Yao-qing，LIU Ju-kun
College Physics. 2018, 37(6): 19-21. doi:
10.16854 /j.cnki.1000-0712.170233
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1781
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For a sphere rotates with an angular velocity in air，Magnus effect plays an important role on the motion of the sphere. By considering the effect of air frication，we have studied kinetics equation of banana kick，and gotten the exact solutions of the kinematic equations. The trajectories of the ball are given out.
To determine the best measuring range of ohmmeter again by carefully calculating the error of zeroing
PAN Ji-ting
College Physics. 2018, 37(6): 22-24. doi:
10.16854 /j.cnki.1000-0712.160462
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2348
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708
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Based on the carefully analyzing and calculating the stochastic error of pointer avometer，which is caused by basic error of galvanometer in measuring resistance ( contain zeroing) on the whole physical process，the measurement formula of uncertainty is derived to obtain the best measuring range of ohmmeter again，to compare and analyze the relevant formulations of textbooks and documents.
Experiment of the characteristic of mutual compensation between Faraday magnetooptical effect and electrogyration effect
LI Chang-sheng，ZHANG Xi，FENG Li-shuang
College Physics. 2018, 37(6): 25-29. doi:
10.16854 /j.cnki.1000-0712.170496
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1226
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The characteristic of mutual compensation between Faraday magnetooptical effect and electrogyration effect is experimentally demonstrated by the use of single lead molybdate ( PbMoO4 ，PMO) crystal.The teaching purpose of this experiment is to help college students to understand similar and inherent characteristic of the two optical effects，i.e.，external field-induced polarization rotation in crystals. Experimental setups mainly include two polarizers，one block of single PMO crystal together with its modulating current and voltage supplies. Under simultaneous application of an ac current and an anti-phased voltage to the PMO crystal，we have observed the phenomenon of mutual compensation between the two effects，and the compensating voltage is about 0.541 kV/A.
Synthesis and transport properties of Bi-based topological insulator nanoplates
WANG Qing-bin1，YE Jun1，CAI Ri1，CHEN Guo-hui1，LIU Jun-ting1，SONG Han-biao2
College Physics. 2018, 37(6): 30-32. doi:
10.16854 /j.cnki.1000-0712.170667
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1318
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517
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Topological insulators have the low transport consumption and could be possibly used as the novel electrical transport materials in transformer substation. Here，we use chemical vapor deposition method to synthesize Bi2Te3 topological insulator nanoplates. Through characterization of optical microscopy，atomic force microscopy and scanning electron microscopy，we optimize the synthetic parameters and further obtain the Bi2Te3 nanoplates. We employe photolithography technique to fabricate metallic electrodes based on nanoplates. We measure the transport properties and observe the weak antilocalization effect originated from the topological surface states. We apply the traditional weak localization theory and find that the coherence length of surface state electrons is approximately 130 nm.
Quantum information science: The second information revolution based on quantum mechanics
ZHANG Wen-zhuo
College Physics. 2018, 37(6): 33-40. doi:
10.16854 /j.cnki.1000-0712.170665
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The quantum information science is a new branch of physics which uses quantum states to carry information， and uses quantum mechanics to transmit and compute information. The quantum information technology can accomplish tasks that classical information technology can not accomplish. The quantum information science includes quantum communication and quantum computing. The quantum communication has entered the industry，and quantum computing also comes out of laboratories. The emerging quantum information industry will lead the next information revolution，and can provide more employment opportunities for graduates from physics.
A study on the number of days of Zhongfu in the summer
LU Jun-ling，GU Chen，QIN Lian-hua，REN Nai-jing
College Physics. 2018, 37(6): 41-44. doi:
10.16854 /j.cnki.1000-0712.170500
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We present a general method to determine the period of Zhongfu ( second of the three ten-day periods of the hot season，sometimes lasting twenty days instead of ten) by accounting the daily order after the summer solstice. Therefore，in the long term，the 20-days of Zhongfu accounts for 71.37%. And the 10-days Zhongfu accounts for 28.63%.
Teaching mode of physics tournamentlinking middle-school and college of comprehensive ability training in physics
LI Chuan-yong，SONG Feng，WANG Hui-tian，YU Hua，
College Physics. 2018, 37(6): 45-49. doi:
10.16854 /j.cnki.1000-0712.170494
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1303
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562
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This paper presents the physics tournament and its development in China，which is a physics teaching practice based on the IYPT. Not only does this activity promote the reforms of methods，contents，and assessment of physics teaching & learning，but also enhances students’comprehensive ability. It introduces a series of open interactive courses. It has been widely accepted and has effectively promoted the link between secondary and tertiary physics teaching，thus，becomes a helpful and creative teaching experiment on talent training in physics
Review，reflection and prospect: research on college physics curriculum and instruction in the past ten years
HAN Si-si，LUO Ying
College Physics. 2018, 37(6): 50-56. doi:
10.16854 /j.cnki.1000-0712.170536
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Static analysis method is applied in the paper to sort out the status of university physics educational research in the past decade based on the core journals. Analysis shows that literacy of the research on physics curriculum and instruction can be summarized as two aspects: Firstly，the university physics classroom instruction is mainly about teaching methods with MOOC and Flipped Classroom as typical representatives; the second is the current teaching situation of experiment of college physics including the curriculum construction and innovative experiment introduced into physics experiment curriculum. It is particularly worth notability that the impact of modern information technology on university physics instruction is increasing with growing number of applications and related research not only in physics classroom instruction but also in physics experiment. According to the review and reflection of this paper，suggestions and expectations are put forward on theory and practice of the physics education in the future.
Research on experiment and simulation for two dimensional standing waves on circular plate whose support coincided with vibration source
CAO Xiao-min，SHAO Gang-ping，LU Xing-chen，LI Cheng-jin，QIAN Zheng
College Physics. 2018, 37(6): 57-60. doi:
10.16854 /j.cnki.1000-0712.170662
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In this paper，the two dimensional standing waves on circular plate whose support coincided with vibration source are measured，calculated and simulated by experiment and MATLAB. The testing results follow with MATLAB’s simulation very well. It has shown a method to measure the Young modulus. It is a significant practice for college physics experiment and simulation.
Finding a more practical principle for experiment of measuring sound speed
RAO Zhi-xiang2，QI Jun-lei2，WANG Jing1，ZHENG Ming1，GAO Hong1
College Physics. 2018, 37(6): 61-65. doi:
10.16854 /j.cnki.1000-0712.160557
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A more practical method to demonstrate the principle of sound speed measurement experiment is proposed. Sound pressure of received side is deduced from the method of small surface element integration. Sound pressure obtained from spherical wave and plane wave source are calculated for comparative study. Compared with the size of the transducer，the distance between the transmitting end and receiving end can not be regarded as infinitely great or infinitely small. In this specific measurement range，the tendency of pressure change with respect to distance obtained from the proposed method is closer to the data measured from experiment. The difference between calculated and measured data is also reduced to less than 1 /10 compared to the last two modes.
Measuring the relative humidity of the air by small changes in capacitance
WANG Yan-zhao，ZHOU Yu，LIU Guo-dong，XIA Yu-qing，ZHANG Ya-nan
College Physics. 2018, 37(6): 66-69. doi:
10.16854 /j.cnki.1000-0712.170443
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The change of air relative humidity will cause the small change of the induced capacitance of the environment.For high quality factor resonant circuit，in its resonant state，the capacitance of small changes will lead to significant changes in signal amplitude. Using these characteristics，a measuring device is designed to obtain the relative humidity of air according to the change of signal amplitude. The device has simple structure，high precision，rapid reaction，can be used in teaching and demonstration and has high commercial promotion value.
Practice and reflection on the experiment teaching of creative production of Electromagnetics
LU Rong-de，CHENG Fu-zhen
College Physics. 2018, 37(6): 70-74. doi:
10.16854 /j.cnki.1000-0712.170509
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This paper introduces the curriculum idea and teaching objective in the classroom of creative production experiment of Electromagnetics，and specific activities and characteristics in the actual teaching process. It is finally given the creative production experiment teaching students learning achievement analysis and reflection. Teachers’experiences and thoughts are also given so as to provide a useful reference for the smooth implementation of the teaching model.
An analysis of the LIGO discovery based on introductory physics
Harsh Mathur，Katherine Brown，Ashton Lowenstein
College Physics. 2018, 37(6): 75-81. doi:
10.16854 /j.cnki.1000-0712.180240
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By observing gravitational radiation from a binary black hole merger，the LIGO collaboration has simultaneously opened a new window on the universe and achieved the first direct detection of gravitational waves.Here this discovery is analyzed using concepts from introductory physics.Drawing upon Newtonian mechanics，dimensional considerations，and analogies between gravitational and electromagnetic waves，we are able to explain the principal features of LIGO’s data and make order of magnitude estimates of key parameters of the event by inspection of the data. Our estimates of the black hole masses，the distance to the event，the initial separation of the pair，and the stupendous total amount of energy radiated are all in good agreement with the best fit values of these parameters obtained by the LIGO-VIRGO collaboration
Just Accepted
